This is my first post here, so please forgive me for being a newb and for being long winded. I own 1 car, and 2 trucks. I live in central North Carolina. I change the oil and filters every 3000 miles or 6 months in the following applications. 1. 2001 Mustang GT, 15,000 miles, driven daily, Mobil 1 5W-30, Mobil 1 filter. 2. 2000 SVT F-150 Lightning, 7500 miles, not driven daily, Mobil 1 5W-30, Mobil 1 filter. 3. 1992 4.3L S-10, 125,000 miles, driven daily, Mobil 1 10W-30, Bosch premium filter. I am not experiencing oil consumption in any of these vehicles. What I am concerned about is the utmost in protection from wear and high heat, especially in the supercharged Lightning. Would it be wise to switch the Mustang to Mobil 1 0W-30 or 0-40 and the Lightning to Mobil 1 15W-50?